1. The blennies have a single dorsal fin, which may be almost, but not completely, divided by a deep notch.

2. Blennies are best displayed in a shallow tank with rocks both above and below the water, line.

3. Some biologists thought that the finger-long red blenny (Parablennius ruber, also called a Portuguese blenny) lived exclusively in Portuguese waters.

4. A freckle - face blenny peeks from its reef burrow in the Solomon Islands.

5. One of the most famous of the blennies is the rock skipper, or zebra blenny.

6. Photo Gallery : Marine Marvels A freckle - face blenny peeks from its reef burrow in the Solomon Islands.